Achange in facial expression, a pause, an altered vocal pitch or speaking rate, and a physical movement all may be used as

The correct response is nonverbal transition.

Explanation:

Changes in such dynamics as facial expression and speaking rate can be considered examples of nonverbal transition. Sometimes we underestimate the importance of these transitions and the more subtle ways they can help us to communicate the meaning of language.  Using nonverbal signposts like a pause in speaking can help you to keep the attention of your audience. Eye contact, gestures, and body language also include implicit messages in what we are trying to convey, whether it is intentional or not.

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explanation: because you need to reduce the pollution on land,the exhaust fumes will stop,and stop it in water,the oil that is in the oceanharms the fish   sorry if you   have been waiting long